* {
  margin: 0;
  padding: 0;
}

.jacket {
  max-width: 720px;
  width: 100vw;
  /* height: 10000px; */
  margin: 0 auto;
  position: relative;
  background-color: #eee;
  position: relative;
}

header {
  height: 40px;
  display: flex;
  position: sticky;
  top: 0;
  background-color: #fff;


  .icon {
    width: 40px;
    align-content: center;
    text-align: center;

    img {
      width: 1.5rem;
    }
  }

  .option {
    margin-right: auto;
    align-content: center;

    b {
      margin: 0 10px;
      color: #666;
    }

    .choose {
      color: #000;
      border-bottom: 2px solid #000;
    }

  }


}

main {
  img {
    width: 100%;
  }
}





/* 页脚 */
footer {

  max-width: 716px;
  width: 100vw;
  height: 3.125rem;
  margin: 0 auto;
  position: fixed;
  bottom: 0;
  border: 1px solid #eee;
  background-color: #fff;
  align-content: center;
  /* width: 100%; */

  nav {
    display: flex;

    a {
      flex: 1;
      text-align: center;
      color: #999;
      /* 清除下滑线 */
      text-decoration: none;
    }

    .box {
      .icon {
        img {
          width: 16px;
          height: 16px;
        }
      }

      p {
        font-size: 12px;
      }
    }
  }
}